Excess Moisture Injury of Soybeans Cultivated in an Upland Field Converted from Paddy : V. Supplemental nitrogen application as a countermeasure against excess moisture injury

Japanese Journal of Crop Science

Tooru SATOU¹  Hideki SUGIMOTO¹ 

关键词: Excess moisture injury;    花器脱落;    Flower shedding;    光合成速度;    Nitrogen fixation;    子実収量;    Photosynthetic rate;    湿害;    Pod shedding;    ダイズ;    Seed yield;    窒素固定;    Soybean;    窒素追肥.;    Supplemental nitrogen.;   

DOI  :  10.1626/jcs.62.47

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

The purpose of this experiment was to examine whether the application of nitrogen (N) fertilizer as ammonium sulfate is an effective countermeasure against excess moisture injury of soybeans [Glycine maz (L.) Merr.]. Soybeans (cv. Tamahomare) were grown in an upland field converted from paddy. Flooding treatment was conducted in furrows to a depth of 5 to 8 cm for 8∼11 days at flower-bud differentiation stage and subsequently fertilizer was applied at the rate of 12 g N per m2. In the flooding plot without supplemental N, seed yield decreased by 20% ; however, in the flooding plot with supplemental N, seed yield decreased only by 6%, since the decreases in pod number were low. The reasons for the low reduction in pod munber were examined in a pot-cultured experiment. Plants under excessive soil moisture and without supplemental N had low N content in the leaf blade which brought about a marked decrease in the photosynthetic rate. In contrast, supplemental N increased the N content in the leaf blade and photosynthetic rate. It was assumed that the increased photosynthetic rate by supplemental N inhibited bud, flower and pod shedding.

【 授权许可】

Unknown